Fair Value of Financial Assets and Liabilities, Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial assets [Abstract]
Debt securities available-for-sale	$ 1,111,505	$ 1,163,724
Equity securities at fair value	3,529	3,158
Federal Reserve Bank stock	4,887	4,887
Carrying Amount [Member]
Financial assets [Abstract]
Cash and cash equivalents	293,298	271,400
Certificates of deposit in other banks	245	245
Debt securities available-for-sale	1,111,505	1,163,724
Equity securities at fair value	3,529	3,158
Loans held for sale	57	152
Loans, net	4,110,604	4,001,363
Federal Home Loan Bank stock	4,440	4,712
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	23,532	23,575
Financial liabilities [Abstract]
Deposits	4,784,270	4,724,622
Repurchase agreements	234,671	225,245
Federal funds purchased	500	500
Advances from Federal Home Loan Bank	329	334
Long-term debt	64,185	64,241
Accrued interest payable	9,365	7,389
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets [Abstract]
Cash and cash equivalents	293,298	271,400
Certificates of deposit in other banks	0	0
Debt securities available-for-sale	323,332	336,285
Equity securities at fair value	0	0
Loans held for sale	59	154
Loans, net	0	0
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Financial liabilities [Abstract]
Deposits	1,016,951	1,260,690
Repurchase agreements	0	0
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	0	0
Accrued interest payable	0	0
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Certificates of deposit in other banks	245	245
Debt securities available-for-sale	788,173	827,439
Equity securities at fair value	0	0
Loans held for sale	0	0
Loans, net	0	0
Federal Home Loan Bank stock	4,440	4,712
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	23,532	23,575
Financial liabilities [Abstract]
Deposits	3,346,616	3,480,806
Repurchase agreements	0	0
Federal funds purchased	500	500
Advances from Federal Home Loan Bank	340	349
Long-term debt	0	0
Accrued interest payable	9,365	7,389
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Certificates of deposit in other banks	0	0
Debt securities available-for-sale	0	0
Equity securities at fair value	3,529	3,158
Loans held for sale	0	0
Loans, net	3,831,409	3,745,477
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Financial liabilities [Abstract]
Deposits	0	0
Repurchase agreements	234,671	225,187
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	49,200	50,326
Accrued interest payable	0	0
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	$ 0	$ 0